I think the problem is that this person is not writing crypto-related code. (or they don't think they do) They write an interface to N underlying interfaces providing RNGs and don't necessarily understand how they work internally or the theory behind them. And that's kind of ok - they made it work correctly, but it could be better.

We don't expect person writing a Ruby binding for sqlite to know the theory behind database indexes and who are the acknowledged experts in that field. Yet we seem to expect that from a person writing binding for RNGs.